Cov txheej txheem:

DNA qauv zoo li cas?
DNA qauv zoo li cas?

Video: DNA qauv zoo li cas?

Video: DNA qauv zoo li cas?
Video: UA TUS QAUV ZOO RAU LUAG XYAUM Music Video By HWJ CHIM VAJ 2022-2023 2024, Kaum ib hlis
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DNA qauv

DNA yog ua los ntawm cov molecules hu ua nucleotides. Txhua nucleotide muaj ib pawg phosphate, pawg suab thaj thiab nitrogen hauv paus. Yog tias koj xav txog ob lub helix qauv as ib tug ntaiv, cov phosphate thiab qab zib molecules yuav yog sab, thaum lub hauv paus yuav yog cov rungs

Tib neeg kuj nug tias, lawv paub DNA zoo li cas?

Cov kws tshawb fawb tau tsim ib txoj hauv kev tshiab ntawm kev ntsuas lub tsev blocks ntawm lub neej. Nws suav nrog lub tshuab ntsuas hluav taws xob thiab lub txaj ntawm tes. Thaum peb saib ntawm cov duab tam sim no-icic ntawm ob lub helix, fuzzy X hauv fuzzy O, peb tsis pom qhov DNA Nws tus kheej ntau npaum li peb pom x-rays deflected los ntawm nws cov atoms.

Tsis tas li ntawd, DNA qauv ua haujlwm li cas? Cov hydrogen bonds ntawm phosphates ua rau lub DNA strand rau twist. Lub hauv paus nitrogenous taw tes rau sab hauv ntawm tus ntaiv thiab tsim ua khub nrog cov hauv paus rau sab nraud, zoo li rungs. Txhua lub hauv paus khub yog tsim los ntawm ob qho ntxiv nucleotides (purine nrog pyrimidine) ua ke los ntawm hydrogen bonds.

Yog li ntawd, DNA puas muaj cov duab tshwj xeeb lossis cov qauv?

Feem ntau DNA puab duab los ntawm cov kws kos duab thiab cov kws tshawb fawb zoo li zoo li tus ntaiv twisting. Cov kws tshawb fawb hu qhov no ua ob lub helix. DNA kuj folds thiab coils nws tus kheej mus rau hauv ntau complex cov duab . Cov coiled puab ua rau nws me me heev.

Puas muaj cov duab DNA?

Cov lus teb luv luv: Yog - Tsawg kawg ib qho, ib daim duab ntawm TEM (kev xa hluav taws xob hluav taws xob) duab, luam tawm Kaum Ib Hlis 2012.

Pom zoo: